One great dbh Connor x Kara fanfiction is 'A New Beginning'. It has a really interesting plot where Connor and Kara have to team up to protect a group of androids in a post - revolution Detroit. The character development is well - done, and it shows their relationship evolving in a very believable way.
I really like 'Unlikely Allies'. In this fanfiction, Connor and Kara are forced to work together despite their initial differences. The story is full of action and also has some really sweet moments between them. It's a great read if you like seeing their relationship develop from a rather rocky start.